- 129 -
List of terms
subcomponent
A component hierarchically named within another (for example, lp/0 v35/0 is a subcomponent of lp/0).
subnet mask
A method for identifying the subnet field from the host field of an address. This divides a network into smaller administrative units called subnetworks or subnets.
successive SET alarm
A SET alarm received while there is an outstanding SET alarm against the same NTP index and component name.
summary address
In PNNI networking, an address prefix that tells a node how to summarize reachability information. See address summarization (page 7).
sustainable cell rate (SCR)
One of a set of traffic characterization values used to define traffic characteristics through the traffic descriptor types.
SCR defines the upper bound of the cell rate that can be sustained for a connection over an indefinite time period. It is used by the network operator to configure the connection to ensure the QOS defined in the traffic contract.
The five values used in the traffic descriptor parameters are peak cell rate (PCR), sustainable cell rate (SCR), maximum burst size (MBS), cell delay variation tolerance (CDVT), and requested shaping rate (RSR).
SVC
1See switched virtual channel (SVC), ATM networking (page 130).
2See switched virtual circuit (SVC) (page 130).
switched multimegabit data service (SMDS)
A set of standards developed by Telcordia for communication over telephone lines.
switched permanent virtual circuit (SPVC)
A type of virtual circuit (VC) that allows configured SPVC endpoints in two different frame relay or ATM networks to establish a switched connection across
Nortel Multiservice Switch 7400/15000/20000
Terminology
PCR7.2 and up March 2006
Copyright © 2006, Nortel | Nortel Confidential |